Recycled aggregate pretreatment equipment

Abstract

The invention discloses recycled aggregate pretreatment equipment. The recycled aggregate pretreatment equipment comprises a pretreatment system, a spraying system and a liquid supply system. The pretreatment system comprises a wetting box, a rolling net drum horizontally arranged in the wetting box in the axial direction, a driving part for driving the rolling net drum to rotate, a receiving bin, and a storage yard, wherein a feeding channel is formed in one end, in the axial direction, of the wetting box, a discharging channel is formed in the other end, in the axial direction, of the wetting box and connected with the receiving bin, and a spiral blade used for guiding recycled aggregate from one end of the rolling net drum to the other end is arranged in the rolling net drum. The spraying system is arranged above the storage yard and used for conducting spraying on recycled aggregate in the storage yard. The liquid supply system is used for providing liquid sources for the wetting box and the spraying system respectively. The recycled aggregate is uniformly pre-wetted through rotating and screening of the rolling net drum, and meanwhile small particles not meeting the particle size requirement, surface-adhering micropowder, impurities and the like in the recycled aggregate are removed; the spraying system conducts spraying on the recycled aggregate in the storage yard, and it is guaranteed that the pretreated recycled aggregate in a surface-wetted state without clear liquid so that the storage quality of the pretreated recycled aggregate can be guaranteed.

Description

Technical field [0001] The invention relates to a pretreatment device for recycled aggregates, belonging to the technical field of production and application of recycled coarse aggregates. Background technique [0002] With the development of economy and the acceleration of urban construction, more and more buildings are demolished because they have reached the service life or cannot meet the requirements of use, resulting in a large amount of construction waste. On the one hand, most of the materials in construction waste are non-renewable resources, such as sand and gravel aggregate resources; on the other hand, the annual consumption of sand and gravel aggregates for engineering construction is as high as 7 billion tons, and massive mining has caused natural Increasing depletion of resources, destruction of rivers, massive erosion of soil and water, and severe deterioration of natural landscapes have led to increasingly severe environmental and resource situations in my country...

AI Technical Summary

Problems solved by technology

However, due to its own shortcomings, such as large water absorption, high fine powder content, high porosity, large crushing index, low density, etc., if recycled aggregate is directly applied to concrete, it will lead to poor workability and collapse of freshly mixed recycled aggregate. Large sag loss, low strength and poor durability after hardening, which greatly limit its application range

Many recycled aggregate strengthening methods have been published. Studies have shown that these strengthening methods can greatly improve the performance of recycled aggregates, thereby improving the performance of recycled aggregate products. However, these strengthening methods are mostly limited to manual operations in laboratories and cannot be applied on a large scale. In actual production, if the pretreatment liquid is directly poured or sprayed in the recycled aggregate yard, uniform pretreatment cannot be achieved, and the quality of recycled aggregate cannot be guaranteed

In addition, the dust emission during the production process of recycled aggregate is large, especially the dust emission at the outlet, which seriously affects the surrounding environment

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